package edu.hncj.seckill.controller;

import com.alipay.api.AlipayClient;
import com.alipay.api.DefaultAlipayClient;
import com.alipay.api.internal.util.AlipaySignature;
import com.alipay.api.request.AlipayTradePagePayRequest;
import edu.hncj.seckill.config.AlipayConfig;
import edu.hncj.seckill.dao.OrderMapper;
import edu.hncj.seckill.domain.Order;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @author gcl
 */
@Controller
@RequestMapping("/alipay")
public class AliPayController {

    @Autowired
    OrderMapper orderMapper;


    /**
     * 支付接口
     * @param request 请求体
     * @param response 返回体
     * @throws Exception
     */
    @RequestMapping("/pay")
    public void pay(HttpServletRequest request, HttpServletResponse response) throws Exception{
        //获得初始化的AlipayClient
        AlipayClient alipayClient = new DefaultAlipayClient(AlipayConfig.gatewayUrl, AlipayConfig.app_id, AlipayConfig.merchant_private_key, "json", AlipayConfig.charset, AlipayConfig.alipay_public_key, AlipayConfig.sign_type);

        //设置请求参数
        AlipayTradePagePayRequest alipayRequest = new AlipayTradePagePayRequest();
        alipayRequest.setReturnUrl(AlipayConfig.return_url);
        alipayRequest.setNotifyUrl(AlipayConfig.notify_url);

        //商户订单号，商户网站订单系统中唯一订单号，必填
        String out_trade_no = new String(request.getParameter("WIDout_trade_no").getBytes("ISO-8859-1"),"UTF-8");
        //付款金额，必填
        String total_amount = new String(request.getParameter("WIDtotal_amount").getBytes("ISO-8859-1"),"UTF-8");
        //订单名称，必填 (中文使用utf-8，否则会乱码)
        String subject = new String(request.getParameter("WIDsubject").getBytes("UTF-8"),"UTF-8");
        //商品描述，可空
        String body = new String(request.getParameter("WIDbody").getBytes("ISO-8859-1"),"UTF-8");

        alipayRequest.setBizContent("{\"out_trade_no\":\""+ out_trade_no +"\","
                + "\"total_amount\":\""+ total_amount +"\","
                + "\"subject\":\""+ subject +"\","
                + "\"body\":\""+ body +"\","
                + "\"product_code\":\"FAST_INSTANT_TRADE_PAY\"}");

        // 使用排他锁查询订单
        Order order = orderMapper.selectByIdAndForUpdate(out_trade_no);

        //输出
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html; charset=utf-8");
        ServletOutputStream out = response.getOutputStream();

        if (order.getOrderStatus().equals(0)){
            //请求
            String result = alipayClient.pageExecute(alipayRequest).getBody();

            out.write(result.getBytes());
        }else{
            out.write(("<script>var nowurl = window.location.href;" +
                    "var charstr = nowurl.split(\"?\")[0];" +
                    "window.location.href = charstr.replace(window.location.pathname,\"/personlist.html\");</script>").getBytes());
        }

    }

    /**
     * 同步通知
     * @param request 请求体
     * @param response 返回体
     * @throws Exception
     */
    @RequestMapping("/returnurl")
    public void returnurl(HttpServletRequest request, HttpServletResponse response) throws Exception{
        response.setContentType("text/html; charset=utf-8");
        response.setCharacterEncoding("utf-8");
        ServletOutputStream out = response.getOutputStream();

        //获取支付宝GET过来反馈信息
        Map<String,String> params = new HashMap<>();
        Map<String,String[]> requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
            String name = (String) iter.next();
            String[] values = (String[]) requestParams.get(name);
            String valueStr = "";
            for (int i = 0; i < values.length; i++) {
                valueStr = (i == values.length - 1) ? valueStr + values[i]
                        : valueStr + values[i] + ",";
            }
            //乱码解决，这段代码在出现乱码时使用
            valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");
            params.put(name, valueStr);
        }

        boolean signVerified = AlipaySignature.rsaCheckV1(params, AlipayConfig.alipay_public_key, AlipayConfig.charset, AlipayConfig.sign_type); //调用SDK验证签名

        //——请在这里编写您的程序（以下代码仅作参考）——
        if(signVerified) {
            //商户订单号
            String out_trade_no = new String(request.getParameter("out_trade_no").getBytes("ISO-8859-1"),"UTF-8");

            //支付宝交易号
            String trade_no = new String(request.getParameter("trade_no").getBytes("ISO-8859-1"),"UTF-8");

            //付款金额
            String total_amount = new String(request.getParameter("total_amount").getBytes("ISO-8859-1"),"UTF-8");

            // 获取订单对象 4.金额异常 1待发货
            Order order = orderMapper.selectByPrimaryKey(out_trade_no);
            order.setOrderStatus(order.getTotalPrice().equals(total_amount)?4:1);
            orderMapper.updateByPrimaryKey(order);

            out.write(("<script>var nowurl = window.location.href;" +
                    "var charstr = nowurl.split(\"?\")[0];" +
                    "window.location.href = charstr.replace(window.location.pathname,\"/personlist.html\");</script>").getBytes());
        }else {
            out.write("验签失败".getBytes());
        }
    }

    /**
     * 异步通知
     * @param request 请求体
     * @param response 返回体
     * @throws Exception
     */
    @RequestMapping("/notify")
    public void notify(HttpServletRequest request, HttpServletResponse response) throws Exception{
        response.setContentType("text/html; charset=utf-8");
        response.setCharacterEncoding("utf-8");
        ServletOutputStream out = response.getOutputStream();

        //获取支付宝POST过来反馈信息
        Map<String,String> params = new HashMap<String,String>();
        Map<String,String[]> requestParams = request.getParameterMap();
        for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
            String name = (String) iter.next();
            String[] values = (String[]) requestParams.get(name);
            String valueStr = "";
            for (int i = 0; i < values.length; i++) {
                valueStr = (i == values.length - 1) ? valueStr + values[i]
                        : valueStr + values[i] + ",";
            }
            //乱码解决，这段代码在出现乱码时使用
            valueStr = new String(valueStr.getBytes("ISO-8859-1"), "utf-8");
            params.put(name, valueStr);
        }

        boolean signVerified = AlipaySignature.rsaCheckV1(params, AlipayConfig.alipay_public_key, AlipayConfig.charset, AlipayConfig.sign_type); //调用SDK验证签名

        if(signVerified) {//验证成功
            //商户订单号
            String out_trade_no = new String(request.getParameter("out_trade_no").getBytes("ISO-8859-1"),"UTF-8");

            //支付宝交易号
            String trade_no = new String(request.getParameter("trade_no").getBytes("ISO-8859-1"),"UTF-8");

            //交易状态
            String trade_status = new String(request.getParameter("trade_status").getBytes("ISO-8859-1"),"UTF-8");

            // 获取订单对象 4.金额异常 1待发货
            Order order = orderMapper.selectByPrimaryKey(out_trade_no);
            order.setOrderStatus(1);
            orderMapper.updateByPrimaryKey(order);

            out.write("success".getBytes());
        }else {//验证失败
            out.write("fail".getBytes());
        }

    }

}
